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Gravity: Analog ORP Sensor PRO

SKU: SEN0464

Gravity: Analog ORP Sensor PRO is an upgraded industrial ORP sensor. It uses a platinum indicator electrode and silver-silver chloride reference electrode, enabling 24-hour online ORP monitoring with enhanced durability. The new signal converter adds a stable voltage reference, so readings aren’t affected by supply voltage fluctuations. Accessories include screws, copper columns, and waterproof connectors for easy ORP monitoring system setup.

Overhead shot of USB-powered ORP Sensor with black cable-DFRobot product sku:SEN0464 image.

Downloadable Resources

  • Docs
  • Tech Specs

    • Specification

    ORP Signal Converter

    Parameter Specification
    Input Voltage 5V
    Input Signal 0.5V ~ 4.5V
    Input Interface 5.08mm/0.20" Pluggable Connector
    Measuring Range -2000mV ~ +2000mV
    Output Interface PH2.0 - 3Pin
    Module Size 42mm×32mm/1.65×1.26"

    Industrial ORP Probe

    Parameter Specification
    Indicator Electrode Platinum
    Reference Electrode silver-silver chloride
    Suitable Temperature 5-70℃
    Electrode Potential 245mV ~ 270mV
    Reference Electrode Internal Resistance ≤10KΩ
    Electrode Stability ±8mV/24h
    Mounting Thread NPT 3/4"

    Pinout

    引脚说明

    Electrode Input

    • S+: Electrode +
    • S-: Electrode -

    Signal Output

    • A: Analog Output
    • +: Power Supply +
    • -: Power Supply -

    FAQ

    • Hi,
      I use this probe to monitor my water that is being treated. The treatment increases the ORP from about 200 mV to 550 mV. The recording works much better than with the previous model and there are less fluctuations.

      However, if I now put the probe into a new sample (ORP = 200 mV) it takes a very long time (> 1 hour) for the displayed value to drop from the 550 mV to the 200 mV. I use your Arduino code, a Arduino Mega 2560 and a Gravity: Analog Signal Isolator. Restarting the Arudino does not help either.

      Why does it take so long? Can you help me please?

      Thank you very much.

      I got the probe and using the sample sketch to get measure the orp values. I always get negative potential. Is there something wrong with the probe?

    • Do the ORP probe need to be calibrated? How often?
      The ORP probe generally don't need to be calibrated, but you can use ORP standards to detect if the probe or signal converter is damaged only when the test results are in doubt.
    • How to clean the ORP probe?
      Rinse the probe with deionized water or potable water until the tested liquid attached to the electrode is completely removed. Don't use a stiffish brush to clean the probe.
    • How long can ORP electrodes be used?
      ORP electrodes are designed to have service life of one year, which may be shortened if the electrodes are operated in harsh environments with high temperature, thickness or strong corrosion. It is recommended to regularly use ORP standards for testing, and replace it in time when the error increases.

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